1515x
002693
2019-03-27

Question

I import an IFC file from another CAD program in RFEM or RSTAB via the CAD/BIM option. During the conversion, I get error messages. Also, the members are not converted correctly.


Answer:

CAD programs that are not primarily used for structural design, usually model the structural elements as solids. A simple rectangular column would consist of 12 lines and 6 surfaces, for example (see the image).


The solids can also be defined in different ways. Either by the boundary surfaces (BREP) or as a sort of "swept solid". The difficulty now is to generate a 1D element from this 3D element. This is usually only possible if the solids were created as a swept solid. The "face" surface defines the cross-section. The correct member position can be determined by the direction and length of the extrusion.

However, in your case, it is a BREP. At this time, we cannot guarantee the correct conversion for this type. This is also referred to in the warning that should appear during the import.